Remember "Description" DSN attribute
Remember "Description" DSN attribute

DSN attribute "Description" was not being copied from the input during DSN
creation in ConfigDSN(). This attribute is now copied into connection info
struct (while parsing input attributes) so that it is later saved (either in
File DSN or user/system DSN entry in Windows registry).

Patch and diagnosis by Nikhil Deshpande

treasure-data/prestogres-odbc,treasure-data/prestogres-odbc,hlinnaka/psqlodbc,gavioto/psqlodbc,gavioto/psqlodbc,hlinnaka/psqlodbc,treasure-data/prestogres-odbc,hlinnaka/psqlodbc,gavioto/psqlodbc